X*(6x+5)<4
    -13*a^2+98*a-120>0
    468*a-12*a*a=1296
    x+sqrt（x^2+1）>0
    x+sqrt（x^2+x）>0
    26700+X-X*10%/4 ≥50000
    4x^2+5x+2=0
    (24+29)+0.3x=92
    (23.2+14.8+14.8)+0.3x=92
    y-(1+y^2)^0.5>0
    2*(3^(1-2x))<5^x
    （31542676.48-x）*0.11=3154267.65
    3.6*7-3x=21
    3b^3+133b-588≥0
    abs（3x-4）＜8
    abs（x-2）≥2
    2（x+3）+1<7
    2x+6+1<7
    X-2%X=1640
    (1/2)^x≤11

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